Chemistry · Alcohols, Ethers and Phenols

JEE Main 2024 — 1 February, Shift 2 — Question 69

Which among the following has highest boiling point?

Option A:
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$
Option B:
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2}-\mathrm{OH}$
Correct
Option C:
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$
Option D:
$\mathrm{H}_{5} \mathrm{C}_{2}-\mathrm{O}-\mathrm{C}_{2} \mathrm{H}_{5}$

Answer: B

Step-by-step solution

Alcohols have the highest boiling points among compounds of comparable molar mass due to strong intermolecular hydrogen bonding arising from the $-\mathrm{OH}$ group. Aldehydes and ethers exhibit only dipole-dipole interactions, while alkanes have only weak dispersion forces.

Hence, $\mathrm{CH_3CH_2CH_2CH_2OH}$ has the highest boiling point.

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 1 February, Shift 2
Subject: Chemistry
Chapter: Alcohols, Ethers and Phenols
Topic: Physical properties, Tests & Uses of alcohols